Ajax select boxes and browser back button

Hello
We had 3 chained drop down boxes on a jsp meaning if we select option from box1, box2 populates. i used ajax:select tag for that. then after selecting all three options user clicks on submit and goes to results page. then hit the back button then only the first option was populated with other two grayed out/empty. user is expecting to see all the three values that he selected. i am not sure whether it would be even possible to do that. please clarify.
Thanks